Valve mechanism



Oct. 29, 1929. c w LEONARD 1,733,309

VALVE MECHANISM Filed June 5. 1928 .17 f 2 15 I I 31 Charla; FIZZ/wizard Patented Oct. 29, 1929 UNITED STATES PATENT OFFICE VALVE MECHANISM Application filed .Tune 5,

This invention aims to provide a novel means whereby the flow can be shut off through the casing of a valve mechanism, gage cook, or the like, whilst the renewable facing for the valve is being changed.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the invention appertains.

WVith the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope of what is claimed, without departing from the spirit of the invention.

In the accompanying drawings Figure 1 shows in elevation, a device constructed in accordance with the invention;

Figure 2 is a longitudinal section wherein parts are in elevation;

Figure 3 is a cross section on the line 3-3 of Figure 2;

Figure 4 is a sectional view showing one end of the valve stem and parts carried thereby, portions being in elevation.

The numeral 1 marks a casing which is shown as used in connection with a gage cock, although the invention is capable of many other applications. The casing 1 includes a base 2 having a wrench head 3, so that one end of the base can be threaded conveniently into the shell 5 of a boiler, if the device is used as a gage cook. The base 2 has an outstanding flange 4. The base 2 has a bore 6 provided with a threaded enlargement 7. The inner end of the base 2 forms a valve seat 28, under conditions which will be pointed out hereinafter. A. hollow body 8 forms part of the casing 1 and is threaded on the base 2, the body abutting at its inner end against the flange 4.

In the body 8 there is a chamber 9 located in front of the seat 28. The chamber 9 has a reduced portion 10, and at the forward end of the reduced portion 10 of the chamber there is a seat 11. In front of the seat 11 is 1928. Serial No. 282,928.

an outlet compartment 12 communicating with a reduced bore 14. The body 8 has a lateral passage 15 communicating with the outlet compartment 12. The article is used as a gage cock. A spout 16 may be mounted in the passage 15. There is a packing gland 17 at the outer end of the body 8.

A stem 18 rotates in the gland l7 and in the bore 14. The stem extends across the outlet compartment 12 and into the part 10 of the chamber 9. A hand wheel 19 is removably secured at 29 on the outer end of the stem 18.

The stem 18 carries a valve disc 20, made of metal. In front of the disc 20 is a facing 21, generally made of fiber or some equivalent material, and in the form of a ring disposed about the stem 18. The stem 18 has longitudinal grooves 22 extending across the outlet compartment 12, into the bore 14 at one end, as shown in Figure 2. The stem 18 is provided on its inner end with an enlarged foot 23 extended across the chamber 9. Throughout most of its length, the foot 23 is threaded at 24 to engage with the threads of the enlarged part 7 of the bore 6. On its outer surface, the part 23 of the stem 18 has passages in the form of grooves 25.

The foot 23 of the stem 18 has a central longitudinal passage 26 provided with lateral branches 27 opening behind the valve disc 20.

When the parts arranged as shown in Figure 2, the facing 21 abuts against the seat 11 and no fluid can pass. By rotating the stem 18 through the instrumentality of the hand wheel 19, the facing 21 may be backed off a little from the seat 11, and then fluid will pass by way of the bore 6, the passage 26 and its branches 27, and the grooves 25. The fluid will flow around the edge of the valve disc 20 and of the facing 21 and will enter the compartment 12, the fluid flowing away through the passage 15 and the spout 16. The operator can bring the facing 21 up tightly against the seat 11 by giving the stem 18 a partial turn, the stem advancing, when it is rotated, because the inner end of the stem is threaded at 24 into the base 2.

If the operator wishes to renew the facing 21, the stem 18 is reversely rotated until the foot 23 retires into the threaded space shown at 7, the lateral outlet 27 then being closed, and the valve disc 20 abuting tightly against the seat 28. Then the hand wheel 19 can be taken off, the body Scan be threaded off the base 2, both the body 8 and the facing 21 being slipped off the stem 18. A new facing can be put back on the stem 18, in engagement with the disc 20. The body 8 then may be threaded back on the base 2, into the position shown in Figure 2, and the hand wheel 19 can be replaced.

The grooves 25 are provided for the purpose of keeping the threads around the stem from corroding, and for the purpose of keeping the threads clear of mud and other foreign matters. The grooves 25, moreover, supplement the passage 26 and give an increased passage for pressure. The grooves 25 give the stem access to the threads shown at 7 and aid in keeping the threads 7 clean, where they are engaged with the threads of the stem.

As to the grooves 22,-it may be stated that if the facing happens to stick to the seat 11 when the disc 20 is backed off, to the left in Figure 2, the grooves 22 Will afford an opening through which the steam can pass.

It will be understood that wherever threads are mentioned, there may be any number of these threads, and they may be right hand or left hand, as occasion may require.

What is claimed is In a device of the class described, a casing having an inlet and an outlet, and provided With spaced seats located between the inlet and the outlet a stem threaded into the easing and provided with a valve disc, a removable facing carried by the stem adjacent the valve disc and cooperating with one seat to stop the flow through the outlet when the stem is moved in one direction, the stem having a longitudinal passage which discharges into the casing at a point behind the valve disc, the stem being movable in an opposite dieection to close the passage and to bring the valve disc into engagement with the other seat, thereby to stop the flow through the casing and to permit a renewal of the facing. I

In testimony that I claim the foregoing as my own, I have hereto affixed my signature.

CHARLES WARREN LEONARD. 

